Implantable devices, systems, and methods for maintaining desired orientations in targeted tissue regions

ABSTRACT

At least one elongated body is sized and configured for implantation in a desired orientation in a tissue region in an airway. An array of projections extends from the elongated body and is resiliently coupled to the elongated body. The array or projections is in a normally biased outward extending condition sized and configured to engage tissue and resist a reorientation of the elongated body within the tissue region out of the desired orientation after implantation of the elongated body in the tissue region. The array of projections is sized and configured to resiliently yield by flexing inward against the elongated body during implantation of the elongated body in the tissue region.

RELATED APPLICATIONS

This application is a continuation-in-part of copending U.S. patentapplication Ser. No. 11/656,699, filed Jan. 23, 2007, and entitled“Systems and Methods for Moving and/or Restraining Tissue in the UpperRespiratory System,” which is a division of U.S. patent application Ser.No. 10/236,455, filed Sep. 6, 2002, and entitled “Systems and Methodsfor Moving and/or Restraining Tissue in the Upper Respiratory System,”which are incorporated herein by reference. This application is also acontinuation-in-part of copending U.S. patent application Ser. No.10/718,254, filed Nov. 20, 2003, end entitled “Devices, Systems andMethods to Fixate Tissue Within the Regions of the Body Such as thePharyngeal Conduit,” which is also incorporated herein by reference.This application also claims the benefit of U.S. Provisional ApplicationSer. No. 60/903,741, filed Feb. 27, 2007, and entitled “Devices,Systems, and Methods to Move or Restrain the Hyoid Bone,” which isincorporated herein by reference.

FIELD OF THE INVENTION

The invention is directed to devices, systems, and methods for thetreatment of sleep disordered breathing including snoring andobstructive sleep apnea.

BACKGROUND OF THE INVENTION

I. Characteristics of Sleep Apnea

First described in 1965, sleep apnea is a breathing disordercharacterized by brief interruptions (10 seconds or more) of breathingduring sleep. Sleep apnea is a common but serious, potentiallylife-threatening condition, affecting as many as 18 million Americans.Snoring also can occur independent of or during a sleep apneic event.

There are two types of sleep apnea: central and obstructive. Centralsleep apnea, occurs when the brain fails to send the appropriate signalto the breathing muscles to initiate respirations, e.g., as a result ofbrain stem injury or damage. Mechanical ventilation is the onlytreatment available to ensure continued breathing.

Obstructive sleep apnea (OSA) is far more common. Normally, the musclesof the upper part of the throat keep the airway open to permit air flowinto the lungs. When the muscles at the base of the tongue and the uvula(the small fleshy tissue hanging from the center of the back of thethroat) relax and sag, the relaxed tissues may vibrate as air flows pastthe tissues during breathing, resulting in snoring. Snoring affectsabout half of men and 25 percent of women—most of whom are age 50 orolder.

In more serious cases, the airway becomes blocked, making breathinglabored and noisy, or even stopping it altogether. In a given night, thenumber of involuntary breathing pauses or “apneic events” may be as highas 20 to 30 or more per hour. These breathing pauses are almost alwaysaccompanied by snoring between apnea episodes, although not everyone whosnores has the condition. Sleep apnea can also be characterized bychoking sensations.

Lack of air intake into the lungs results in lower levels of oxygen andincreased levels of carbon dioxide in the blood. The altered levels ofoxygen and carbon dioxide alert the brain to resume breathing and causearousal. The frequent interruptions of deep, restorative sleep oftenlead to early morning headaches, excessive daytime sleepiness,depression, irritability, and learning and memory difficulties.

The medical community has become aware of the increased incidence ofheart attacks, hypertension and strokes in people with moderate orsevere obstructive sleep apnea. It is estimated that up to 50 percent ofsleep apnea patients have high blood pressure.

Upon an apneic event, the sleeping person is unable to continue normalrespiratory function and the level of oxygen saturation in the blood isreduced. The brain will sense the condition and cause the sleeper tostruggle and gasp for air. Breathing will then resume, often followed bycontinued apneic events. There are potentially damaging effects to theheart and blood vessels due to abrupt compensatory swings in bloodpressure. Upon each event, the sleeping person will be partially arousedfrom sleep, resulting in a greatly reduced quality of sleep andassociated daytime fatigue.

Although some apneic events are normal in all persons and mammals, thefrequency of blockages will determine the seriousness of the disease andopportunity for health damage. When the incidence of blockage isfrequent, corrective action should be taken.

II. The Anatomy of the Upper Airway

As FIG. 1 shows, the upper airway consists of a conduit that begins atthe nasal valve, situated in the tip of the nose, and extends to thelarynx, which is also called the voice box because it houses the vocalcords. The pharynx (which, in Greek, means “throat”) is a cone-shapedpassageway in the upper airway that leads from the oral and nasalcavities in the head to the esophagus and larynx. The pharynx servesboth respiratory and digestive functions. Both circular and longitudinalmuscles are present in the walls of this organ, which are called thepharyngeal walls. The circular muscles form constrictions that help pushfood to the esophagus and prevent air from being swallowed, while thelongitudinal muscles lift the walls of the pharynx during swallowing.

The pharynx consists of three main divisions. The superior portion isthe nasal pharynx, the back section of the nasal cavity. The nasalpharynx connects to the second region, the oral pharynx, by means of apassage called an isthmus. The oral pharynx begins at the back of themouth cavity and continues down the throat to the epiglottis, a flap oftissue that covers the air passage to the lungs and that channels foodto the esophagus. The isthmus connecting the oral and nasal regionsallows humans to breathe through either the nose or the mouth. The thirdregion is the laryngeal pharynx, which begins at the epiglottis andleads down to the esophagus. Its function is to regulate the passage ofair to the lungs and food to the esophagus. Air from the nasal cavityflows into the larynx, and food from the oral cavity is routed to theesophagus directly behind the larynx. The epiglottis, a cartilaginous,leaf-shaped flap, functions as a lid to the larynx and, during the actof swallowing, controls the traffic of air and food.

The mouth cavity marks the start of the digestive tube. Oval in shape,it consists of two parts: the vestibule and the mouth cavity proper.

The vestibule is the smaller outer portion, delimited externally by thelips and cheeks and internally by the gums and teeth. It connects withthe body surface through the rima or orifice of the mouth. The vestibulereceives the secretion of the parotid salivary glands and connects whenthe jaws are closed with the mouth cavity proper by an aperture on bothsides behind the wisdom teeth, and by narrow clefts between opposingteeth.

The mouth cavity proper contains the tongue and is delimited laterallyand in the front by the alveolar arches with the teeth thereincontained. The alveolar process on the upper jaw is contained in themaxillae, whereas the alveolar process on the lower jaw is contained inthe mandible. The mandible is a U-shaped bone that supports themandibular (lower) teeth.

The mouth cavity proper receives the secretion from the submaxillary andsublingual salivary glands. The mouth cavity proper connects with thepharynx by a constricted aperture called isthmus faucium.

The tongue (see FIG. 1B) is a mobile muscular organ that can assume avariety of shapes and positions. The tongue comprises extrinsic andintrinsic muscles. The extrinsic muscles (genioglossus, hyoglossus,styloglossus, and palatoglossus) (shown in FIG. 1B) have their origin inother structures and attach to the tongue. Their function is to move thetongue and, at times, change its shape. The intrinsic muscles of thetongue (superior longitudinal, inferior longitudinal, transverse,vertical) (not shown with particularity) are attached entirely withinthe tongue work to modify the shape of the tongue. The inferior surfaceof the tongue (see FIG. 1C) is covered with a thin, transparent mucousmembrane through which one can see the underlying veins. With the tongueraised (as shown in FIG. 1C), the lingual frenulum is exposed. Thelingual frenulum is a large, midline fold of mucosa that connects thetongue to the floor of the mouth, while allowing the anterior part ofthe tongue to move freely.

The tongue has a relatively fixed inferior part that is attached to thehyoid bone and mandible. The rest of the tongue is called the body ofthe tongue. It is essentially a mass of muscles (that is mostly coveredby mucous membrane. The muscles in the tongue do not act in isolation.Some muscles perform multiple actions with parts of one muscle actingindependently producing different, sometimes antagonistic, actions.

The tongue is partly in the mouth or oral cavity and partly in thepharynx. At rest, it occupies essentially the entire oral cavity. Theposterior part of the tongue demarcates the posterior boundary of theoral cavity. Its mucous membrane is thick and freely movable.

The tongue is involved with mastication, taste, articulation, and oralcleansing. Its two main functions are forming words during speaking andsqueezing food into the pharynx when swallowing.

The epiglottis is a protective fold of the cartilage posterior to thebase of the tongue and in front of the larynx. When a human breathes,the epiglottis stands up, allowing air to go into the larynx and lungs.During swallowing, the epiglottis folds back to cover the larynx andkeep food from entering the windpipe and lungs. Once the swallowing isover, the epiglottis resumes its upright position.

The palate forms the arched roof of the oral or mouth cavity (the mouth)and the floor of the nasal cavities (the nose). It separates the oralcavity from the nasal cavities and the nasal pharynx. The palateconsists of two regions—the hard palate anteriorly and the soft palateposteriorly.

The hard palate is vaulted and defines the space filled by the tonguewhen it is at rest. The hard palate is bounded in the front andlaterally by the alveolar arches and gums and in the back by the softpalate. A dense structure made up by the periosteum and the mucousmembrane of the mouth covers the hard palate. The linear raphé liesalong the middle line of the hard palate. The hard palate has a hardbony skeleton, hence its name.

The soft palate has no bony skeleton, hence its name. The soft palate isa movable fold, suspended from the posterior border of the hard palateand forms an incomplete dividing line (septum) between the mouth and thepharynx. The soft palate comprises a mucous membrane that envelopsmuscular fibers, an aponeurosis, vessels, nerves, adenoid tissue, andmucous glands. When the soft palate is relaxed and hanging, the anteriorsurface is concave and follows the same line as the roof of the mouth.The posterior surface of the soft palate is convex and is a continuanceof the mucous membrane that covers the bottom part of the nasalcavities. The upper boundary of the soft palate attaches to the hardpalate; the sides become part of the pharynx; and the lower boundary isfree. The lower boundary which hangs down, separating the mouth and thepharynx is known as the palatine velum. In the middle of the lowerboundary, the small, fleshy cone-shaped protuberance is called theuvula; the uvula prevents the food from entering the nasopharynx and themuscles of the soft palate push the food down into the pharynx. Thearches are located laterally and downwardly from the uvula. These archesare called the glossopalatine arch (the anterior arch) and thepharyngopalatine arch (the posterior arch). The palatine aponeurosis isa thin, firm fiber-filled lamella which gives support to the muscles andmakes the soft palate strong.

The soft palate is suspended from the posterior border of the hardpalate. It extends posteriorly and inferiorly as a curved free marginfrom which hangs a conical process, called the uvula; closely followingbehind the soft palate are the palatoglossal and the palatopharyngealarches, respectively. Muscles arise from the base of the cranium anddescend into the soft palate. The muscles allow the soft palate to beelevated during swallowing into contact with the posterior pharyngealwall. The muscles also allow the soft palate to be drawn inferiorlyduring swallowing into contact with the posterior part of the tongue.

The soft palate is thereby very dynamic and movable. When a personswallows, the soft palate initially is tensed to allow the tongue topress against it, to squeeze the bolus of food to the back of the mouth.The soft palate is then elevated posteriorly and superiorly against thepharyngeal wall, acting as a valve to prevent passage of food into thenasal cavity.

Caudal to the soft palate, the hyoid bone is situated at the base of thetongue in the anterior part of the neck at the level of the C3 vertebraand in the angle between the mandible and the thyroid cartilage of thelarynx, the voice box. It is a symmetric U-shaped bone (see FIG. 2B),comprising a body with greater horns and lesser horns, which serve aspoints of attachment for numerous muscles in the tongue, pharynx, andthe anterolateral part of the neck (see FIGS. 3A to 3D).

The hyoid bone does not articulate with any other bone. It serves apurely anchoring function for muscles. The hyoid bone is suspended fromthe styloid processes of the temporal bones by the stylohyoid ligamentsand is firmly bound to the thyroid cartilage. Functionally, the hyoidbone serves as an attachment point for numerous muscles and a prop tokeep the airway open. The primary function of the hyoid bone is to serveas an anchoring structure for the tongue.

FIGS. 3A to 3D show some of the numerous muscles that are attached tothe hyoid bone (as does FIG. 1B). The muscles attached to the hyoid boneinclude the middle pharyngeal constrictor muscle (see FIG. 3A), whichattaches at the end of the greater horns. The middle pharyngealconstrictor muscle, together with the superior and inferior pharyngealconstrictor muscles (also shown in FIG. 3A), extend along the upperairway. As before stated, a change in muscle function of the pharyngealconstrictor muscles can lead to pharyngeal narrowing and collapse.

The muscles attached to the hyoid bone also include the hyoglossusmuscles (see FIGS. 3B and 3D, as well as FIG. 1B). The hyoglossusmuscles originate along the entire length of each greater horn and alsofrom the body of the hyoid. The hyoglossus muscles are inserted into theposterior half or more of the sides of the tongue, as FIG. 3D bestshows. The hyoid bone anchors the hyoglossus muscles when they contract,to depress the tongue and to widen the oral cavity, thereby opening theairway.

The muscles attached to the hyoid bone also include the two geniohyoidmuscles (see FIG. 3C). The geniohyoid muscles originate close to thepoint at which the two halves of the lower jaw meet; the fibers of themuscles extend downward and backward, close to the central line, to beinserted into the body of the hyoid bone. Contraction of the geniohyoidmuscles pulls the hyoid bone upward and forward, shortening the floor ofthe mouth and widening the pharynx.

Inserting into the middle part of the lower border of the hyoid bone arethe sternohyoids (see FIG. 3C). The sternohyoids are long musclesarising from the breastbone and collarbone and running upward and towardeach other in the neck. The sternohyoids depress the hyoid bone after ithas been elevated during swallowing.

Other muscles attached to the hyoid bone are the two mylohyoid muscles(see FIG. 3C), which form a sort of diaphragm for the floor of themouth, elevating the floor of the mouth and tongue during swallowing;the thyrohyoid (see FIG. 3C), arising from the thyroid cartilage of thelarynx, which elevates the larynx; and the omohyoid (see FIG. 3C), whichoriginates from the upper margin of the shoulder blade, which depresses,retracts, and steadies the hyoid bone.

The position of the hyoid bone with relation to the muscles attached toit has been likened to that of a ship steadied as it rides when anchored“fore and aft.” Through the muscle attachments, the hyoid plays animportant role in mastication, in swallowing, and in voice production.

The larynx, also known as the organ of voice, is part of the upperrespiratory tract. As FIG. 1A shows, the larynx is situated between thebase of the tongue and the trachea; vertically, the larynx's positioncorresponds to the C4, C5, and C6 vertebrae, although this location ishigher in females and during childhood. FIG. 2A shows the ninecartilages of the larynx: a thyroid, a cricoid, two arytenoids, twocorniculate, two cuneiform, and an epiglottis.

The larynx comprises extrinsic ligaments which link the thyroidcartilage and the epiglottis with the hyoid bone and the cricoidcartilage with the trachea (see FIG. 2B). The hyothyroid membrane andthe lateral hyothyroid ligament attach the thyroid cartilage to thehyoid bone. The hyoepiglottic ligament connects the epiglottis to theupper border of the hyoid bone. The cricotracheal ligament attaches thecricoid cartilage to the first ring of the trachea (see FIG. 2B).

III. Sleep and the Anatomy of the Upper Airway

Although all tissue along this conduit is dynamic and responsive to therespiratory cycle, only the pharynx is totally collapsible. Thepharyngeal structures and individual anatomic components within thisregion include the pharyngeal walls, the base of the tongue, the softpalate with uvula, and the epiglottis.

The cross-sectional area of the upper airway varies with the phases ofthe respiratory cycle. At the initiation of inspiration (Phase I), theairway begins to dilate and then to remain relatively constant throughthe remainder of inspiration (Phase II). At the onset of expiration(Phase III) the airway begins to enlarge, reaching maximum diameter andthen diminishing in size so that at the end of expiration (Phase IV), itis at its narrowest, corresponding to the time when the upper airwaydilator muscles are least active, and positive intraluminal pressure islowest. The upper airway, therefore, has the greatest potential forcollapse and closure at end-expiration [ref: Schwab R J, Goldberg A N.Upper airway assessment: radiographic and other imaging techniques.Otolaryngol Clin North Am 1998, 31:931-968].

Sleep is characterized by a reduction in upper airway dilator muscleactivity. For the individual who snores or has obstructive sleep apnea(OSA) and perhaps the other disorders which comprise much of the groupof entities called obstructive sleep-disordered breathing (SDB), it isbelieved that this change in muscle function causes pharyngeal narrowingand collapse. Two possible etiologies for this phenomenon in OSApatients have been theorized. One is that these individuals reduce theairway dilator muscle tone more than non-apneics during sleep (theneural theory). The other is that all individuals experience the samereduction in dilator activity in sleep, but that the apneic has apharynx that is structurally less stable (the anatomic theory). Boththeories may in fact be contributors to OSA, but current studies seem tosupport that OSA patients have an intrinsically structurally narrowedand more collapsible pharynx. [Ref: Isono S. Remmers J, Tanaka A Sho Y,Sato J, Nishino T. Anatomy of pharynx in patients with obstructive sleepapnea and in normal subjects. J Appl Physiol 1997:82:1319-1326.]Although this phenomenon is often accentuated at specific sites, such asthe velopharyngeal level [Isono], studies of closing pressures [Isono]support dynamic fast MRI imaging that shows narrowing and collapseusually occurs along the entire length of the pharynx. [Ref: Shellock FG, Schatz C J, Julien P, Silverman J M, Steinberg F, Foo T K F, Hopp ML, Westbrook P R. Occlusion and narrowing of the pharyngeal airway inobstructive sleep apnea: evaluation by ultrafast spoiled GRASS MRimaging. Am J of Roentgenology 1992:158:1019-1024].

IV. Treatment Options

To date, the only treatment modality that addresses collapse along theentire upper airway is mechanical positive pressure breathing devices,such as continuous positive airway pressure (CPAP) machines. All othermodalities, such as various surgical procedures and oral appliances, bytheir nature, address specific sectors of the airway (such as palate,tongue base and hyoid levels), but leave portions of pharyngeal walluntreated. This may account for the considerably higher success rate ofCPAP over surgery and appliances in controlling OSA. Although CPAP,which in essence acts as an airway splint for the respiratory cycle, ishighly successful, it has some very significant shortcomings. It can becumbersome to wear and travel with, difficult to accept on a sociallevel, and not tolerated by many (for reasons such as claustrophobia,facial and nasal mask pressure sores, airway irritation). These factorshave lead to a relatively poor long-term compliance rate. One study hasshown that 65% of patients abandon their CPAP treatment in 6 months.Other current treatments for OSA include genioglossal advancement (GA),maxillomandibular advancement (MA), and hyoid myotomy. InfluENT Medicaloffers a genioglossus advancement procedure where suture loop is passedthrough the tongue and anchored to a screw essentially inserted into themandible. In another procedure, hyoid myotomy and suspension, the hyoidbone is advanced using a suture tied to the hyoid bone anchors thestructure to two screws placed in the mandible. These treatments involvehighly invasive surgical procedures and a long recovery time, andtherefore have relatively low patient appeal.

The need remains for simple, minimally invasive, cost-effective devices,systems, and methods for reducing or preventing sleep disorderedbreathing events.

SUMMARY OF THE INVENTION

Devices, systems, and methods are provided by maintaining tissue regionsin desired orientation in or along an airway, e.g., for reducing orpreventing snoring and/or sleep disordered breathing events, such assleep apnea.

In one aspect, the devices, systems, and methods provide an implantsystem comprising at least one elongated body sized and configured forimplantation in a desired orientation in a tissue region in an airway.An array of projections extends from the elongated body and isresiliently coupled to the elongated body. The array or projections isin a normally biased outward extending condition sized and configured toengage tissue and resist a reorientation of the elongated body withinthe tissue region out of the desired orientation after implantation ofthe elongated body in the tissue region. The array of projections issized and configured to resiliently yield by flexing inward against theelongated body during implantation of the elongated body in the tissueregion.

In one embodiment, the desired orientation of the elongated bodyincludes a state of tension, and a component can be further provided toadjust the state of tension.

In various embodiments, the elongated body can be sized and configuredfor implantation in a desired orientation in a palate, or in a uvula, orin a tongue, or in an epiglottis, or in a muscle along an upperrespiratory tract.

In various embodiments, a tissue anchor and/or a bone anchor can becoupled to the elongated body.

In one embodiment, an implantation tool can be provided that is sizedand configured to be introduced into the tissue region and have aninterior bore accommodating passage of the elongated body forimplantation in the tissue region.

In another aspect, the devices, systems, and methods provide a methodcomprising selecting a tissue region in an airway, and providing atleast one elongated body sized and configured for implantation in adesired orientation in the tissue region. The elongated body includes anarray of projections extending from the elongated body. The array ofprojections is resiliently coupled to the elongated body in a normallybiased outward extending condition sized and configured to engage tissueand resist a reorientation of the elongated body within the tissueregion out of the desired orientation after implantation of theelongated body in the tissue region. The array of projections is sizedand configured to resiliently yield by flexing inward against theelongated body during implantation of the elongated body in the tissueregion. The method implants the at least one elongated body to stabilizea desired orientation of the tissue region.

In various embodiments, the tissue region selected can include a palate,or a uvula, or a tongue, or an epiglottis, or a muscle along an upperrespiratory tract.

In one embodiment, the method can include placing the at least oneelongated body in a state of tension in the tissue region, e.g., byanchoring the at least one elongated body to tissue or to bone.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is an anatomical sagittal cross-section of a normal human nasalairway, oral cavity, and oropharyrnx.

FIG. 1B is an anatomical sagittal view of the muscles of the upperrespiratory tract.

FIG. 1C is an anatomic anterior view of an oral cavity, with the body ofthe tongue elevated to show the inferior side of the tongue and thefloor of the mouth.

FIG. 1D is an anatomical side view, with sections partly broken away andin section, of a human suffering from one form of sleep apnea involvingthe tongue and the soft palate, showing how the tongue base, the softpalate, and the uvula lean against the pharyngeal wall, effectivelyclosing off the airway, resulting in an apneic event.

FIGS. 2A and 2B are anatomic views of the larynx.

FIG. 2A shows the cartilages of the larynx while FIG. 2B shows ananterolateral view of the ligaments of the larynx.

FIGS. 3A to 3D are anatomic views of the muscles attached to the hyoidbone.

FIG. 4A is an illustrative embodiment of an elongated body sized andconfigured for implantation in a desired orientation in a tissue regionin an airway, having an array of projections that are configured toengage tissue and resist a reorientation of the body within the tissueregion out of the desired orientation.

FIG. 4B is a view of the elongated body shown in FIG. 4A being implantedin a tissue region, showing the projections resiliently yielding byflexing inward against the body when the body is inserted through tissuein the intended implantation direction.

FIG. 4C is a view of the elongated body shown in FIG. 4A being implantedin a tissue region, showing the projections resiliently yielding byflexing inward against the body when the body is inserted through animplantation tool in the intended implantation direction.

FIG. 4D is a view of the elongated body shown in FIG. 4A afterimplantation in a tissue region, showing the resilient projectionsextending outward to engage tissue and serve to resist movement of thebody in tissue in a direction that is different than the insertiondirection.

FIG. 4E is a view of the elongated body shown in FIG. 4A afterimplantation in a tissue region, showing the resilient projectionsextending outward to engage tissue and serve to resist movement of thebody in tissue in a direction that is different than the insertiondirection, which movement applies tension to the elongated body thataffects a change in the shape or orientation of the tissue region inwhich the elongated body is implanted.

FIGS. 5A and 5B show a method of treating sleep apnea in the softpalate. FIG. 5A shows a sagittal view of a human suffering from sleepapnea due to abnormalities in the soft palate. FIG. 5B shows theelongated body of FIG. 4A implanted in the human of FIG. 5A.

FIGS. 6A and 6B show a method of treating sleep apnea in the uvula. FIG.6A shows a sagittal view of a human suffering from sleep apnea due toabnormalities in the uvula. FIG. 6B shows the elongated body of FIG. 4Aimplanted in the human of FIG. 6A.

FIGS. 7A and 7B show a method of treating sleep apnea in the tongue.FIG. 7A shows a sagittal view of a human suffering from sleep apnea dueto abnormalities in the tongue. FIG. 7B shows the elongated body of FIG.4A implanted in the human of FIG. 7A.

FIGS. 8A and 8B show a method of treating sleep apnea in the epiglottis.FIG. 8A shows a sagittal view of a human suffering from sleep apnea dueto abnormalities in the epiglottis. FIG. 8B shows the elongated body ofFIG. 4A implanted in the human of FIG. 8A.

FIGS. 9A and 9B show a method of treating sleep apnea in the upperrespiratory muscles. FIG. 9A shows a sagittal view of a human sufferingfrom sleep apnea due to abnormalities in the upper respiratory muscles.FIG. 9B shows the elongated body of FIG. 4A implanted in the human ofFIG. 9A.

FIG. 10A shows an illustrative portion of an elongated body comprising abarbed suture with unidirectional barbs.

FIG. 10B shows an illustrative portion of an elongated body comprising abarbed suture with multidirectional barbs.

FIGS. 11A to 11E show an instrument and a method of inserting barbedsutures in the palate. FIG. 11A shows an illustrative instrument forinserting barbed sutures into the palate. FIG. 11B is a sidecross-sectional view of a portion of the hard palate and the soft palatewith an illustrative instrument for inserting barbed sutures inserted inthe palate. FIG. 11C is a side cross-sectional view of the hard palateand the soft palate with an illustrative instrument for inserting barbedsutures and illustrative barbed sutures threaded through the instrument.FIG. 11D is a side cross-sectional view of the hard palate and the softpalate with an illustrative end piece. FIG. 11E is a sidecross-sectional view of the hard palate and the soft palate with barbedsutures and end piece inserted.

FIGS. 12A to 12E are anatomical sagittal views of a human upperrespiratory system showing a method of inserting a barbed suture in thetongue.

FIGS. 12F and 12G are illustrative embodiments of needles used to insertbarbed sutures in the tongue.

FIGS. 13A to 13D are anatomical views of the oral cavity showing analternate method of inserting a barbed suture in the tongue.

FIGS. 14A to 14F are anatomical views of the oral cavity showingalternate embodiments of inserting one or more barbed suture(s) in thepalate and uvula.

FIGS. 15A and 15B are anatomical sagittal views of the muscles of theupper respiratory tract, similar to those shown in FIG. 1B and FIG. 3C,respectively, showing barbed sutures that have been implanted to affectdesired tissue orientations.

FIGS. 16A to 16C are anatomical sagittal views showing barbed suturesinserted in the epiglottis.

FIGS. 17A to 17C are anatomical views of the oral cavity showing suturesinserted in the palate.

FIG. 18A is an anatomical view of the oral cavity showing a device foradjusting tension in sutures.

FIG. 18B is a perspective view of a device for adjusting tension insutures.

FIG. 18C is a cross-sectional view of the device of FIG. 18B implantedin the palate as shown in FIG. 18A.

FIGS. 19A and 19B are perspective views of an alternate device foradjusting tension in sutures.

FIG. 20 is a side cross-sectional view of an alternate device foradjusting tension in sutures.

FIG. 21 is a perspective view of an alternate device for adjustingtension in sutures.

FIG. 22A is a side view of an alternate device for adjusting tension insutures.

FIG. 22B is a top plan view of the device shown in FIG. 22A.

FIG. 22C is a cross-sectional view of the device of FIG. 22A implantedin the palate.

FIG. 23A is an anatomical view of the upper respiratory system.

FIGS. 23B and 23C are cross-sectional views of the tongue showing amethod of inserting an implant structure comprising a bracing member inan extrinsic muscled region beneath a tongue.

FIGS. 24A to 24C are anatomical views of the upper respiratory systemshowing an implant structure comprising a hooking member buckleimplanted in an extrinsic muscle region beneath a tongue.

FIGS. 25A and 25B are anatomical views of the upper respiratory systemshowing an implant structure comprising an elastomeric structureimplanted in an extrinsic muscle region beneath a tongue.

FIGS. 26A to 26D are views of an illustrative embodiment of an elongatedelastomeric body sized and configured for implantation in a desiredorientation in a tissue region in an airway. FIG. 26A is a perspectiveview of an elastomeric body in its relaxed state. FIG. 26B is aperspective view of an elastomeric body of 26A in a slightly extendedstate. FIG. 26C is an end view of the elastomeric body of FIG. 26A. FIG.26D is a perspective view of the elastomeric body of FIG. 26A in anextended state.

FIGS. 27A to 27D are views of an illustrative embodiment of an elongatedelastomeric body sized and configured for implantation in a desiredorientation in a tissue region in an airway. FIG. 27A is a perspectiveview of an elastomeric body in its relaxed state. FIG. 27B is aperspective view of an elastomeric body of 27A in a slightly extendedstate. FIG. 27C is an end view of the elastomeric body of FIG. 27A. FIG.27D is a perspective view of the elastomeric body of FIG. 27A in anextended state.

FIGS. 28A to 28B are views of an illustrative embodiment of an elongatedelastomeric body sized and configured for implantation in a desiredorientation in a tissue region in an airway. FIG. 28A is a perspectiveview of an elastomeric body in its relaxed state. FIG. 28B is aperspective view of the elastomeric body of FIG. 28A in an extendedstate.

FIGS. 29A to 29B are views of an illustrative embodiment of an elongatedelastomeric body sized and configured for implantation in a desiredorientation in a tissue region in an airway. FIG. 29A is a perspectiveview of an elastomeric body in its relaxed state. FIG. 29B is aperspective view of the elastomeric body of FIG. 29A in an extendedstate.

FIGS. 29C to 29G are anatomical sagittal views showing a method ofinserting the elastomeric body of FIG. 29A or 29B in a human.

FIG. 30A is perspective view of the elastomeric body of FIG. 26D held inan extended state by a bio-absorbable material.

FIG. 30B is perspective view of the elastomeric body of FIG. 26D held inan extended state by an absorbable suture.

FIG. 30C is a perspective view of the elastomeric body of FIG. 27D heldin an extended state by a bio-absorbable material.

FIG. 30D is a perspective view of the elastomeric body of FIG. 27D heldin an extended state by an absorbable suture.

FIGS. 30E and 30F are perspective views of the elastomeric body of FIG.27G held in an extended state by bioabsorbable beads.

FIG. 31A is a perspective view of the elastomeric body of FIG. 30Bfurther including a stent anchor.

FIG. 31B is a perspective view of the elastomeric body of FIG. 30Afurther including a stent anchor.

FIG. 31C is a perspective view of the elastomeric body of FIG. 31A or31B wherein the spring has returned to its relaxed state and the stentanchor has deployed.

FIGS. 32A to 32C are anatomical sagittal views showing a method ofinserting the elastomeric body of FIG. 31A or 31B in a human.

FIG. 33A is a perspective view of the elastomeric body of FIG. 30Bfurther including a daisy anchor.

FIG. 33B is a perspective view of the elastomeric body of FIG. 30Afurther including a daisy anchor.

FIG. 33C is a perspective view of the elastomeric body of FIG. 33A or33B wherein the spring has returned to its relaxed state and the daisyanchor has deployed.

FIGS. 34A to 34C are anatomical sagittal views showing a method ofinserting the elastomeric body of FIG. 33A or 33B in a human.

FIG. 34D is an anatomical sagittal view showing an alternate embodimentof the elastomeric body of FIG. 33A or 33B inserted in a human.

FIG. 35A is a perspective view of a spring expander for use with theelastomeric body of FIG. 26A.

FIG. 35B is a perspective view of the spring expander of FIG. 35A withan elastomeric body threaded thereon.

FIG. 35C shows the spring expander of FIG. 35B, wherein the tension inthe elastomeric body is being adjusted by unthreading the springexpander from a portion of the elastomeric body.

FIGS. 36A to 36E show an elastomeric body coupled to a spring expanderand a method of inserting the coupled elastomeric body and springexpander.

DESCRIPTION OF PREFERRED EMBODIMENTS

Although the disclosure hereof is detailed and exact to enable thoseskilled in the art to practice the invention, the physical embodimentsherein disclosed merely exemplify the invention which may be embodied inother specific structures. While the preferred embodiment has beendescribed, the details may be changed without departing from theinvention, which is defined by the claims.

This specification discloses various methods, systems, and devices tomaintain or aid in maintaining a patent, or open, airway. However, whilethe various methods, systems, and devices have application in proceduresrequiring the restriction of tissue collapse in and/or around the body,such as a passageway within the body, the various devices, systems, andmethods are not necessarily restricted to tissue-based applications.

The devices, systems, and methods are particularly well suited fortreating sleep disordered breathing, including sleep apnea. For thisreason, the devices, systems, and methods will be described in thiscontext. It should however be appreciated that the disclosed devices,systems, and methods are applicable for use in treating otherdysfunctions elsewhere in the body, which are not necessarily sleepdisorder related.

I. Anatomical Considerations and Sleep Apnea

In human beings the tongue is an organ that undergoes a wide variety ofmovements, partly because it is involved in a broad range of activities,including speech, eating and swallowing. When a human is awake, thetongue normally moves in an up and forward position. When a human isasleep, the muscles of the tongue relax and the tongue is able to movein an even broader range of directions. This movement can occurlaterally, posteriorly, anteriorly, cranially, caudally, in a rollingmanner, or any combination thereof.

The tongue can move in conjunction with other structures (i.e. tongueand pharyngeal wall coming together or tongue and palate comingtogether) or independently of other structures, such as tongue movementwithout palate, posterior wall, or epiglottis movement.

Sleep apnea occurs when the airway becomes obstructed. Hypopnea occurswhen the airway is partially obstructed. Sleep apnea can take manyforms. The closure of the airway can occur at any number of anatomicalstructures along the airway, including any combination of the tongue,soft palate, epiglottis, pharyngeal walls, and hyoid bone. Inparticular, the tongue may collapse with respect to the pharyngeal wall,or both the base of the tongue and the pharyngeal wall may collapse atthe same time. Thus, sleep apnea may be treated by preventing thecollapse of the specific anatomical structures.

FIG. 1A is a sagittal cross section view of the upper airway system in anormal patient, showing the nasal and oral cavities, tongue, hardpalate, soft palate, oropharynx, chin and neck. FIG. 1B shows a sideview of a patient suffering from one form of sleep apnea involving thetongue and palate. As shown in FIG. 1B, the tongue base, the softpalate, and the uvula lean against the pharyngeal wall, effectivelyclosing off the airway. An apneic attack can occur as a result.

II. The Treatment of Sleep Apnea

As described above, sleep apnea occurs when the airway becomesobstructed. Obstruction of the airway can be caused when muscles in atleast a portion of the upper respiratory system lose tone and allow theairway to become obstructed. The present invention contemplatesinserting various devices into various tissues of the upper respiratorysystem to reshape, relocate, or tension the surrounding tissue.

A representative device 10 for treating sleep apnea is shown in FIG. 4A.As shown in FIG. 4A, the treatment device 10 takes the form of anelongated body that is sized and configured for implantation in adesired orientation in a tissue region. Although the body 10 may haveany cross-sectional shape, in the illustrated embodiment, the body 10has a generally circular cross-section. The elongated body 10 may beflexible to facilitate implantation of the body 10 in a targeted tissueregion of an individual and thereafter conform to the orientationdesired, which will depend upon the morphology of the tissue region andthe particular treatment objectives. The elongated body 10 is alsodesirably generally non-elastic and/or otherwise has the mechanicalresilience or strength capable of holding a tension, which will be inshorthand called “tension-able.” The elongated body 10 can be made of athreadlike inert plastic or metal material, e.g., nylon, polypropylene,or stainless steel. One or more elongated bodies 10 can be implanted ata selected tissue region, depending upon the treatment objectives.

An array or plurality of projections 12 extend from the elongated body10. As shown in FIG. 4A, the projections 12 extend radially outward atan acute angle α relative to the longitudinal axis of the body 10. Theprojections 12 are sized and configured to engage tissue and anchor thebody 10 within a tissue region. By their design, the projections allowthe elongated body 10 or a section of the elongated body 10 to move moreeasily through tissue in one direction than the other.

The projections 12 are desirably resiliently coupled to the body 10 in anormally biased outward extending condition. In this arrangement, theprojections 12 can be folded back upon the body 10 by application offorce, and resilient return to the normally biased outward extendingcondition when the force is removed. The projections 12 themselves canalso be flexible.

In the illustrated embodiment (see FIGS. 4A and 4B), the projections 12extend from the body 10 in a direction opposite the direction in whichthe body 10 is intended to be inserted into a tissue region duringimplantation (shown by the insertion arrow in FIG. 4B). In this manner(as FIG. 4B shows), the projections 12 are capable of yielding byflexing inward against the body 10 when the body 10 is pulled throughtissue in the intended implantation direction.

Alternatively (as shown in FIG. 4C), the body 10 can be implantedthrough a guide tube or needle. In this arrangement, the projections 12are capable of flexing inward against the body 10 when carried withinthe guide tube, and extending outward to engage tissue when the guidetube or needle is withdrawn (as FIG. 4D shows).

Regardless of the manner of implantation, after implantation of the body12, the projections 12 will engage tissue and serve to resist movementof the body 10 in tissue in a direction that is different than theinsertion direction (as shown by the resistance arrow in FIG. 4D). Asshown in FIG. 4D, the resistance direction can lie in a range ofdirections angularly displaced about a direction directly opposite tothe insertion direction.

As shown in FIG. 4E, due to the orientation of the projections 12,pulling the elongated body 10 either during or after implantation in adirection that lies within the range of resistance directions, appliestension to the elongated body 10 and can affect a change in the shape ororientation of the tissue region in which the elongated body 10 isimplanted.

In use, the elongated body 10 is implanted in a desired orientation in atissue region. The desired orientation is governed by the location ofthe tissue region and the treatment objectives, e.g., a desired shape orbias that is to be imparted to the tissue region, and/or the maintenanceof a desired orientation of the tissue region relative to another tissueregion, e.g., to keep an airway patent. The array of projections 12 flexor otherwise yield to accommodate the implantation of the body 10 in thedesired orientation. The desired orientation can include the selectiveapplication of tension to the elongated body 12 during its implantation,to affect a desired change in shape, orientation, and/or otherphysiologic characteristic within the tissue region.

During and after implantation of the body 10 in the desired orientation,the projections 12 serve to engage tissue, resisting a reorientation ofthe body 10 within the tissue region out of the desired orientation.When the orientation includes applying a tension to the body 10 duringimplantation, the projections 12 serve to maintain the tension, so thatthe tissue region itself is maintained in a desired orientation by theresistance that projections 12 impart.

A. Implantation within a Soft Palate

Obstructive sleep apnea can arise when tissue of the soft palate becomes“floppy.” As shown in FIG. 5A, the floppy tissue of the soft palate maycollapse upon the back of the tongue or other airway structures andthereby obstruct the airway. It is therefore desirable to tension and/orreposition the tissue of the soft palate to reduce or eliminate thisobstruction of the airway.

The treatment device 10 described above can be used to either tensionand/or reposition the tissue of the soft palate to reduce theobstruction of the airway, as shown in FIG. 5B. In this representativeembodiment, one or more of the elongated bodies 10 are implanted in adesired orientation in a tissue region of the soft palate. The desiredorientation in this embodiment is governed by the treatment objective ofmaintaining the soft palate in a desired posterior and/or superiororientation away from the back of the tongue and other airwaystructures. The body 10 is implanted in an orientation and with aselective tension which shapes the soft palate in this desiredorientation (shown in FIG. 5B), away from the back of the tongue andother airway structures.

In this arrangement, the projections 12 are oriented relative to thebody 10 to flex or otherwise yield to accommodate the implantation ofthe body 10 in the desired orientation within the soft palate. Afterimplantation, the projections 12 extend outward at the angle α from thebody 10 and serve to engage tissue and resist a reorientation of thebody 10 within the tissue region of the soft palate out of the desiredorientation, to thereby resist collapse of the soft palate in ananterior and/or inferior direction, i.e., toward the base of the tongue.

B. Implantation within an Uvula

Obstructive sleep apnea can also arise when the uvula becomes “floppy”and/or misshapen, as shown in FIG. 6A. If the uvula becomes floppy, itcan become positioned in a posterior direction, collapsing against theback of the tongue and/or the pharyngeal wall, and obstruct the airwayas shown in FIG. 6A. It is therefore desirable to either tension and/orreposition the uvula in an anterior direction to reduce obstruction ofthe airway.

The treatment device 10 described above can be used to tension and/orreposition the uvula to reduce obstruction of the airway as shown inFIG. 6B. In this representative embodiment, one or more of the elongatedbodies 10 are implanted in a desired orientation in a tissue region ofthe uvula. The desired orientation in this embodiment is governed by thetreatment objective of maintaining the uvula in a desired anteriorand/or superior orientation lifted away from the back of the tongue andthe pharyngeal wall. The body 10 is implanted in an orientation and witha selective tension which shapes or urges the uvula in this desiredorientation (shown in FIG. 6B), away from the back of the tongue and thepharyngeal wall.

In this arrangement, the projections 12 are oriented relative to thebody 10 to flex or otherwise yield to accommodate the implantation ofthe body 10 in the desired orientation within the uvula. Afterimplantation, the projections 12 extend outward at the angle α from thebody 10 and serve to engage tissue and resist a reorientation of thebody 10 within the tissue region of the uvula out of the desiredorientation, to thereby resist collapse of the uvula toward the base ofthe tongue and/or against the pharyngeal wall.

C. Implantation within a Tongue

Obstructive sleep apnea can also arise when the tongue muscles losetone, causing the base of the tongue to collapse in a posteriordirection against the uvula and/or pharyngeal wall, and thereby obstructthe airway, as shown in FIG. 7A. It is therefore desirable to eithertension the muscles in the tongue, or otherwise reposition the tongue toreduce obstruction of the airway.

The treatment device 10 described above can be used to tighten themuscles in the tongue as shown in FIG. 7B. In this representativeembodiment, one or more of the elongated bodies 10 are implanted in adesired orientation in a tissue region of the tongue. The desiredorientation in this embodiment is governed by the treatment objective ofurging or maintaining the tongue in a desired anterior orientation awayfrom the uvula and/or pharyngeal wall. The body 10 is implanted in anorientation and with a selective tension which urges the tongue in ananterior direction (shown in FIG. 7B), away from the uvula and/orpharyngeal wall.

In this arrangement, the projections 12 are oriented relative to thebody 10 to flex or otherwise yield to accommodate the implantation ofthe body 10 in the desired orientation within the tongue. Afterimplantation, the projections 12 extend outward at the angle α from thebody 10 and serve to engage tissue and resist a reorientation of thebody 10 within the tissue region of the tongue out of the desiredorientation, to thereby resist posterior collapse of the tongue againstthe uvula and/or the pharyngeal wall.

D. Implantation within an Epiglottis

Another source of obstructive sleep apnea includes abnormalities of theepiglottis, which close off or restrict the airway, as shown in FIG. 8A.For example, the epiglottis may prolapse and fold down to close off theairway. It is also possible that the epiglottis may be misshapen andtherefore restrict the airway. The epiglottis may also lose muscle toneand become “floppy.” A floppy epiglottis can restrict the airway. It istherefore desirable to either tension or reposition the epiglottis toreduce obstruction of the airway.

The treatment device 10 described above can be used to tension and/orreposition the epiglottis to reduce obstruction of the airway as shownin FIG. 8B. In this representative embodiment, one or more of theelongated bodies 10 are implanted in a desired orientation in a tissueregion of the epiglottis. The desired orientation in this embodiment isgoverned by the treatment objective of maintaining or urging theepiglottis in a desired anterior orientation away from the pharyngealwall. The body 10 is implanted in an orientation and with a selectivetension which urges the epiglottis in an anterior direction (shown inFIG. 8B), away from the pharyngeal wall.

In this arrangement, the projections 12 are oriented relative to thebody 10 to flex or otherwise yield to accommodate the implantation ofthe body 10 in the desired orientation within the epiglottis. Afterimplantation, the projections 12 extend outward at the angle α from thebody 10 and serve to engage tissue and resist a reorientation of thebody 10 within the tissue region of the epiglottis out of the desiredorientation, to thereby resist posterior collapse of the epiglottisagainst the pharyngeal wall.

E. Implantation in Muscles of the Upper Respiratory Tract

Another source of obstructive sleep apnea is when the muscles in thepharyngeal wall along the upper respiratory tract lose tone. When themuscles relax, they may obstruct the airway as shown in FIG. 9A. This isparticularly true in individuals with excessive relaxation of the upperrespiratory muscles, or in individuals where the airway is alreadynarrow. An individual's airway may naturally be narrow due to theindividual's particular morphology, or may be narrow due to otherfactors such as obesity or other illness. It is therefore desirable totension the muscles in the upper respiratory tract to reduce obstructionof the airway.

The treatment device 10 described above can be used to tighten themuscles of the upper respiratory tract, as shown in FIG. 9B. In thisrepresentative embodiment, one or more of the elongated bodies 10 areimplanted in a desired orientation in a muscle region of the upperrespiratory system. The desired orientation in this embodiment isgoverned by the treatment objective of maintaining or urging the musclein a desired orientation, away from collapse against other structuresalong the airway. The body 10 is implanted in an orientation and with aselective tension which urges the muscle region in this orientation(shown in FIG. 9B), away from collapse against other structures alongthe airway.

In this arrangement, the projections 12 are oriented relative to thebody 10 to flex or otherwise yield to accommodate the implantation ofthe body 10 in the desired orientation within the muscle region of theupper respiratory system. After implantation, the projections 12 extendoutward at the angle α from the body 10 and serve to engage tissue andresist a reorientation of the body 10 within the muscle region of theupper respiratory system out of the desired orientation, to therebyresist collapse of the muscle region against other structures along theairway.

F. Use of the Treatment Device

The treatment device 10 can be used in the treatment of sleep apnea inat least one of three different ways.

First, the treatment device 10 may be used, by itself, to effectivelytreat sleep apnea. It is contemplated that the treatment device 10 couldbe utilized in many parts of the upper airway, including, but notlimited to the uvula, the soft palate, the hard palate, the tongue, themuscles of the upper respiratory tract, or the epiglottis, as previouslydescribed.

Second, the treatment device 10 can provide temporary treatment of sleepapnea allowing the individual and the treating physician time toevaluate whether more invasive surgery intervention, e.g.,uvulopalatoplasty (UPPP), may offer as results.

Third, the treatment device 10 can be used in conjunction with othertypes of sleep apnea treatment, such as the magnetic force systemsdisclosed in U.S. patent application Ser. No. 10/656,861, filed Sep. 6,2003, and entitled “Magnetic Force Devices, Systems, and Methods forResisting Tissue Collapse Within the Pharyngeal Conduit.” Due toindividual anatomical constraints, a system consisting of ferromagneticstructures may benefit from being supplemented by the use of thetreatment device 10 to provide additional tension in specific upperrespiratory tissue locations.

III. Representative Examples of the Treatment Device

A. Barbed Sutures

The treatment device 10 as described above can be constructed in variousways. In one representative embodiment, the treatment device 10 takesthe form of a barbed suture 110, as shown in FIGS. 10A and 10B. Thebarbed suture 110 comprises an elongated body that is sized andconfigured for implantation in a desired orientation in a tissue regionof an airway. The suture 100 can comprise a flexible threadlike plasticor metal material, such as nylon, polypropylene, or stainless steel,which is, desirably, essentially tension-able, as earlier defined.

The barbed suture 110 includes an array of projections or barbs 112. Theprojections 112 extend from the elongated suture body at the angle α andare sized and configured to engage tissue and anchor the elongatedsuture body in the tissue region. The array of projections or barbs 112thereby resists a reorientation of the elongated suture body within thetissue region out of the desired orientation.

The projections or barbs 112 can be produced, for example, by cutting ata slant into the elongated suture body to form sharp projections thatbend back. The projections or barbs 112 can run either in the samedirection (i.e., unidirectionally) (as shown in FIG. 10A) or twodifferent directions (i.e., bidirectionally) (as shown in FIG. 10B) fromthe elongated suture body midpoint. An un-barbed section can follow thebarbed sections at both ends of the sutures 110.

B. Representative Instrument and Method for Implanting a Barbed Suturein an Uvula

As generally described above, one or more barbed sutures 110 can beimplanted in a uvula 14. FIG. 11A shows a representative instrument 16for use in inserting the barbed sutures 110. The instrument 16 comprisesa hollow sharp needle 18 with a large enough bore 20 to pass a suture110. The hollow sharp needle 18 may be attached to a handle 22.Preferably, the needle 18 has a gently curved shape, similar to the softpalate 24. The needle 18 includes a proximal end by the handle 22 and adistal end spaced from the handle.

As shown in FIG. 11C, the suture 110 comprises a series of tissuegrasping barbs 112, as previously described. The suture 110 alsoincludes an adjustable, sliding toggle anchor 26 at one end (see FIG.11C). The sliding toggle anchor 26 will be described in more detailbelow. As an alternative, a needle 18 may be suaged to the barbed suture110, without a handle.

The implantation procedure can be performed under general or localanesthesia. As seen in FIG. 11B, with the individual's mouth open, thedistal end of the needle 18 is placed submucosally into the soft palate24, starting at the uvula 14, to penetrate into muscle tissue. Thedistal end of the needle 18 is then advanced to the soft and hard palatejunction area. The distal end of the needle exits back into the oralcavity, as FIG. 11B shows. The tissue at the needle exit site in thevicinity of the hard/soft palate junction is firm fibromuscle.

Prior to the needle exiting the mucosa, a small transverse incision ismade through the mucosa at the needle exit site to develop a smallsubmucosal pocket 30 (which FIG. 11B shows).

As seen in FIG. 11C, once the distal end of the needle 18 has exited themucosa, the barbed suture 110 with an adjustable toggle end anchor 26 isfed retrograde through the distal end of the needle 18 (i.e., the sutureend that does not carry the toggle anchor 26 being inserted into thedistal end of the needle end first), exiting at the uvula entrance site32 near the proximal end of the needle. As seen in FIG. 11D, the hollowneedle 18 is then withdrawn, leaving the suture 110 in place in the softpalate 24. In this orientation of the suture body, the barbs 112 areoriented to engage tissue and resist movement of the suture body whenthe end of the suture 110 carrying the toggle anchor 26 is pulled.

Alternatively, a curved needle 18 suaged to the end of the barbed suture110 could penetrate the palate 24 near the hard palate-soft palatejunction, exit at the distal end of the uvula 14, and draw the barbedsuture 110 into position behind it (not shown).

Regardless of the suture insertion method used, the portion of thesuture 110 visible at the uvula 14 may then be trimmed. The end of thesuture 110 carrying the toggle anchor 26 is pulled to pull the oppositeend of the suture 110 antegrade, to bury the opposite end lined withbarbs 112 in submucosal uvula tissue. This begins to place the suturebody into tension, as the barbs 112 resist movement of the suture bodyin the pulling direction. The tension begins to lift and curve the uvulain anterior and superior directions.

The individual's mouth is then closed, leaving the toggle end of thesuture 110 protruding out of the mouth. With the individual in a supineposition, a flexible nasopharyngoscope is passed trans-nasally to viewthe retropalatal airway.

The toggle end of the suture 110 is pulled further in an anteriordirection (antegrade in the palate), further engaging the barbs 112 andfurther placing the suture in the desired orientation within the uvula.Placing the suture into the desired orientation also applies morelocalized tension in the tissue region. In response, the uvula and, withit, the soft palate in general, move toward the desired forward-curvedorientation to attain an appropriate posterior palatal airway space, asshown in FIG. 6B. The orientation of the airway space continues to beviewed by nasopharyngoscope as tension is selectively applied by pullingon the toggle end of the suture 110. If the patient is awake, this isdone at end expiration, and verified with Mueller maneuvers. If asleepunder anesthesia or sedation, palate flaccidity and obstruction will beevident.

The mouth is then reopened, and as shown in FIG. 11E, the toggle 26 isslid down the suture and cinched down on the suture 110 at thepreviously made hard/soft palate submucosal junction pocket 30.

The procedure is finalized by closing the submucosal junction pocket 30.The submucosal junction pocket 30 may be closed using any medicallyaccepted devices and methods.

The implantation procedure may consist of placing one or more barbedsutures 110, depending on the clinical need. The number of barbedsutures 110 placed will be determined by the physician based on theindividual patient morphology.

The implantation of an elongated body with projections, such as a barbedsuture 110, makes possible a less morbid, less damaging and lessinvasive alternative to a surgical uvulopalatoplasty. The implantationof an elongated body with projections, such as a barbed suture 110, canalso serve as an alternative to existing treatments for habitualsnoring. When tensioning of the elongated body is done under sedatedendoscopy, it has the capability of being a one-stage titratablesuspension procedure. Presently available approaches (laser resection,radiofrequency stiffening, and Pillar implant stiffening) do not havethat capability.

An elongated body with projections such as a barbed suture 110, can beremoved under local anesthesia by freeing the submucosal toggle 26,localizing the uvula end of the suture 110, and pulling the suture bodyout retrograde, as will be described in more detail below.

C. Representative Instrument and Method of Implanting a Barbed Suture inthe Tongue

One or more barbed sutures 110 can be inserted in the tongue 34 to pullthe tongue 34 anteriorly and retain a patent airway. The tongue base canbe pulled anteriorly by use of barbed sutures 110 in various ways.

In one representative embodiment (as shown in FIGS. 12A to 12E), anincision is made in the skin and a small hole is drilled in the mandible36 at the attachment point for the genioglossus muscle 38 (see FIG.12A). As seen in FIG. 12A, access to this drill hole in the bone can bemade either at the front of the chin or intra-orally.

A length of either unidirectional or bidirectional barbed suture 110with a stop or button 40 attached at one end is threaded through aneedle 42. The button 40 is desirably sized so that it is too large tofit through the hole in the jaw. The needle 42 and suture 110 isinserted into an application shaft 44. The application shaft 44 isinserted into the hole in the jaw. Using a plunger 46, the needle isthen pushed through the tongue 34 (as shown in FIG. 12A) and removedfrom the posterior portion of the tongue 34 (as shown in FIG. 12B). Theneedle is removed through the mouth. The plunger 46 and the applicationshaft 44 are then removed from the hole in the jaw, leaving the suture110 behind within the tongue.

The suture 110 is then pulled in an anterior direction through the jaw(as shown in FIG. 12C). Because the barbs 112 are oriented to engagetissue and resist movement of the suture body in the pulling direction,the suture body is placed into tension within the tongue, pulling theposterior region of the tongue in an anterior direction. Securing thebutton 40 to the suture 110 in a position resting against the jaw boneor mandible 36 (see FIG. 12D) holds the tension. The tension holds theposterior region of the tongue in an anterior direction, resistingposterior movement in the direction of the airway. The tongue 34 isthereby positioned so that the suture barbs 112 hold it in a forwardposition, so as to open the airway.

As seen in FIG. 12E the suture 110 is trimmed slightly below the surfaceof the tongue 34. The tissue is then closed over the button 40 tocomplete the procedure. Multiple sutures 110, possibly attached to thesame button 40, could be advantageous. It is also contemplated that theneedle 42 could be inserted through the jaw without the use of theapplication shaft 44 and plunger 46.

To aid in the removal of the needle 42, the needle 42 desirably isflexible, short and attached to a longer application shaft (FIG. 12F),or of a type used with sewing machines (FIG. 12G). A flexible needle 42can be easily bent to facilitate pulling it out of the posterior part ofthe tongue 34. A short needle 42 would be removed from the applicationshaft and taken out through the mouth, while the application shaft wouldbe withdrawn through the jaw hole. Alternatively, the sewingmachine-style needle 142 would allow the suture 110 to be removed fromthe needle at the back of the tongue 34.

In another representative embodiment (as shown in FIGS. 13A and 13B), anincision is made with a curved needle 242 close to the lingual frenulum48 at or near the inferior base of the tongue 34 and into extrinsicmuscle (e.g., the genioglossus muscle) beneath the tongue. A barbedsuture 110 threaded through the hole of the curved needle 242 followsthe curvilinear path of the needle 242. As a result, the suture 242 isimplanted in a curved or curvilinear orientation (a loop 50) in theextrinsic muscle at the inferior base of the tongue, as FIG. 13B shows.By pulling on the end of the suture 110 extending from the needleentrance site in a direction opposite to the direction of insertion (asshown in FIG. 13 c), tension is applied to the suture, because the barbs112 extend outward at an angle α to engage tissue and resist movement inthis direction. The tension cinches the suture loop into a more tightlycurved orientation, and the barbs 112 resist a reorientation of thesuture out of this orientation. The tension tightens up the extrinsicmuscle at the inferior base of the tongue. In response, the tongue 34 ismoved anteriorly, as shown in FIG. 13D. More than one barbed suture 100can be implanted in extrinsic muscle at or near the inferior base of thetongue in this manner.

In a different approach, one or more barbed sutures can be implantedwith curved needle(s) through an incision under the chin on the insideedge of the mandible 36. In this arrangement, the curved needle 242 isdirected through both the geniohyoid and genioglossus muscles, formingthe loop 50. Cinching the looped barbed suture 110 in the manner justdescribed will tighten up the genioglossus and the geniohyoid muscles,thereby moving the tongue 34 anteriorly.

One or more looped barbed sutures, implanted in extrinsic muscles at ornear the inferior base of the tongue create an anterior tension in thetongue similar to genioglossal advancement, but without requiringattachment to a mandible. Barbed sutures in the geniohyoid muscle couldaffect a hyoid advancement, as will be discussed later.

D. Representative Instrument and Method of Implanting Barbed Sutures inthe Palate and Uvula

One or more barbed sutures 110 can be implanted in the palatal arch 52to improve the tone of the palate 24, and reduce what is called a“floppy palate.”

In a representative embodiment of a palatal procedure (see FIGS. 14A and14B), one or more barbed sutures 110, each threaded to a curved needle242, is passed through the soft palate 24 perpendicular to the midline54 of the palate 26 (see FIG. 14A). By pulling on the end of the suture110 extending from the needle entrance site in a direction opposite tothe direction of insertion (as shown in FIG. 14B), tension is applied tothe suture, because the barbs 112 extend outward at an angle α to engagetissue and resist movement in this direction. The tension creates tonein the soft palate 24 (see FIG. 14C). The exposed ends of the suture aredesirably trimmed, so that the two ends do not stick out of the mucosaof the soft palate 24. Similarly, barbed sutures 110 can be placed in anorientation to tension the palatal arch 52 upward toward the hardpalate. The sutures 110 may or may not be attached to the hard palate.

The oral cavity can be the site for a number of additional oralternative procedures. For example, as FIG. 14D shows, one or morebarbed sutures 110 running along the midline 54 of the soft palate 24can shorten the uvula 14. Each suture 110 is inserted by a curved needle242 in an orientation parallel to the midline 54 of the uvula 14. Again,both ends of the barbed suture 110 are trimmed so as not to stick out ofthe mucosa. A loop of barbed suture 110 can be inserted in the samefashion starting in the hard palate 28, continuing into the uvula 14,and then returning to the hard palate 28. The tension in the loop willretract the uvula 14.

As shown in FIGS. 14E and 14F, one or more barbed sutures can be eachinserted by a curved needle 242 to pass in a desired orientation througheither or both pharyngopalatine and glossopalatine arches 52, based uponthe individual patient's needs.

E. Representative Instrument and Method of Implanting Barbed Sutures inthe Upper Respiratory Tract Muscles

Implanting one or more barbed sutures 110 in one or more desiredorientations to tension any combination of the lateral pharyngeal wallmuscles, including the stylohyoid, hyoglossus, stylopharyngus,palatoglossus, palatopharyngeus and pharyngeal constrictor muscles(shown in FIG. 15A), can help eliminate lateral airway wall collapse.The desired orientation in this embodiment is governed by the treatmentobjective of tensioning the barbed sutures 110 to shorten the muscles inan axial (i.e., generally inferior to superior) direction, or tensioningthe muscle(s) laterally by attachment to the underlying structures, forexample the prevertebral fascia. A combination of techniques, such asaxial sutures 110 that run laterally into the underlying structures atone end, could also be used.

Implanting one or more barbed sutures 110 in one or more desiredorientations to tension any of the muscles that attach to the hyoid(e.g. the strap muscles, omohyoid, geniohyoideus, etc.) (see FIG. 15B)can serve to advance, or re-position the hyoid to open the airway.Combination of sutures 110, e.g., placed in the palatine arch (aspreviously described) as well as placed in muscles along the upperrespiratory tract, can treat broad sections of the airway.

F. Representative Instrument and Method of Implanting Barbed Sutures inthe Epiglottis

One or more barbed sutures 110 can be implanted in an epiglottis 56 toretain a patent airway (see FIGS. 16A and 16B). Barbed sutures 110 canhelp treat a “floppy epiglottis” in various ways.

As shown, for example, in FIG. 16A, the suture 110 could be placed sothat it lends tone to the epiglottis 56 without significant tensioning.As shown in FIG. 16B, the sutures 110 could create tension within theepiglottis 56 by attaching to other structures or simply “bunching” thetissues of the epiglottis 56. As shown in FIG. 16C, the sutures 110could be placed through the epiglottis 56 and attached to otherstructures (e.g. thyroid cartilage, hyoid bone, geniohyoid muscle, etc.)to re-position the epiglottis 56.

IV. Standard Sutures and the Treatment of Apnea

Traction stitch uvuloplasty on the soft palate 24 may also be performedusing standard, non-barbed sutures forming a suture loop 50 see FIG.17A. The standard suture loop 50 can be applied using a needle thatwould be inserted in the hard palate 28 and then exit briefly at theuvula 14, and then continue back up through the uvula 14 tissue, toreturn for the final exit through and eventual attachment to the hardpalate 28.

As another alternative shown in FIG. 17B, the suture loop 50 could rundirectly through the soft tissue at the junction of the hard palate 28and soft palate 24. A sliding knot could allow tensioning of the loop 50to adjust uvular position; however, it is desirable to also use anadditional device 58, as described in the section that follows, toaffect this tension.

The uvula end of the suture loop 50 may require using a pledget 60 toprevent the tissue from tearing or reforming, see FIG. 17C. The pledget60 would desirably be buried through a mucosal incision attached to thesurrounding tissue or contain barbs (not shown) to help the pledget 60grip to the tissue. In the preferred embodiment, the pledget 60 isformed as a pad that sits between the tissue of the patient and thesuture. In an alternative embodiment, the suture may run through thepledget 60.

In order to facilitate potential removal of the traction stitch, thepledget 60 should desirably contain ferromagnetic/magnetic orradio-opaque material. Desirably, the termination of the loop 50 at thehard palate 28 will permit adjustability to fine-tune the stitchtension, both interoperatively and via a simple in-office procedure.

V. Adjustment and Removal of Method of Sutures in the Oral Cavity andUpper Respiratory Tract

A. Adjustment of Sutures

The tension in the sutures 110/210 may be adjusted in various ways. Asseen in FIGS. 18A to 18C, one of the means for adjustment of the tensionin the suture 210 involves a tapered peg 58. In this method, a baseplate 62 containing a hole 64 is attached to the hard palate 28. As seenin FIG. 18B, the suture 210 is threaded through and tied to a taperedpeg 58 fitted for the hole 64 in the base plate 62. The length of thesuture 210 is then adjusted to maximize its therapeutic result bytwisting the tapered peg 58 to wrap the end of the suture 210, around itand then inserting and securing the tapered peg 58 into the hole 64 inthe base plate 62 (as shown in FIG. 18C). This type of adjustment mayalso be used with barbed sutures 110. The barbed part of the suture 110is passed through the soft tissue to its desired anchoring point (e.g.,the uvula), as previously described. In the case of barbed sutures 110,the smooth end is threaded through and tied to the tapered peg 58. Therest of the adjustment remains the same as for standard sutures 210.

Alternative embodiments of tensioning means include a peg and a holethat have grooves or other surface features to improve the grip,tapering that is applied to either the peg or the hole, but not both,the peg and the hole can have relatively straight profiles, e.g. notapering, but have significant features that allow them to interlock, ina similar fashion to gear teeth. As shown in FIGS. 19A and 19B, oneembodiment includes a first structure 162 through which the suture 110is threaded. A second peg-like structure 158 screws into the firststructure 162 and, by screwing into the first structure 162, forces thesuture 110 to deviate from its normal straight path (see FIG. 19B). Thedeviation of the suture 110 shortens the suture 110 in the soft tissueand thus, serves to tighten the suture 110.

As shown in FIG. 20, another alternative includes a second structure 258that can lock into the first structure 262 in such a manner as to gripthe suture 110/210 between the two structures 258/262. One or both ofthe structures 258/262 would desirably be tapered to grip the suture110/210, arranged so that tension in the suture 110/210 tightens theinterface between the structures 258,262.

In yet another embodiment shown in FIG. 21, a miniature cam cleat 358would be used to grip the suture. As the suture 110/210 is pulled in thedirection indicated by the arrows, the cam cleat 358 is pulled intotighter engagement and the suture 110 is secured between the cam cleats358. Other suture-gripping devices include devices designed to gripropes in mountain climbing or sailing, in a miniature version.

As seen in FIGS. 22A, 22B, and 22C, another means of adjusting thebarbed sutures 110/210 involves using a plastic or titaniummushroom-type device 458. FIG. 22A shows a mushroom-type device 458which includes a stem 466 with a hole 468 through which a suture 110/210will be threaded. The stem 466 of the mushroom-type device 458 is placedin a pocket either in the oral cavity tissue itself or in a basestructure that is attached to the oral cavity tissue, see FIGS. 22B and22C. The suture 110 will be twisted around the mushroom stem 466 toadjust the tension. The head 470 of the mushroom will be stapled,sutured, or attached to either an additional hole in the hard palate 28or at the junction of the soft palate 24 and hard palates 28, so as tostabilize its rotation. The mushroom shape 458 has the advantage ofpresenting a smooth profile over which the mucosa can easily heal.Although the mushroom 458 is preferably made of plastic or titanium, itshould be clear to one of skill in the art that the mushroom 458 couldbe made of any medically acceptable material.

B. Removal of Sutures

Removal of sutures is a particularly important issue with respect tobarbed sutures 110. Barbed sutures 110 cannot be removed likeconventional sutures which, in the absence of knots, can be moved freelyin either direction. The barbed sutures 110 are free to move in onedirection—from the initiation point to the anchoring point (e.g., fromthe hard palate to the uvula). Therefore it is desirable to be able toeasily identify the anchoring point. One solution involves placing anidentifiable marker close to the anchoring point, such as a pledget 60,see FIG. 17C. The identifiable marker must be easy to find either bypalpation or by using a probe. For example, the marker may be X-raylocatable, or the marker may comprise a ferromagnetic bit which could belocated using a magnetic probe. Another alternative involves using anultrasonic probe that will set off a resonant frequency.

Once the marker is located, the surgeon may cut through the surroundingtissue to get to the marker and stabilize it. An incision is then madeat the insertion point to snip the barbed suture 110 at its attachmentpoint. Then, while holding on to the identifiable marker, the barbedsuture 110 is pulled through its anchoring point.

VI. Systems and Methods for Implanting Structures in, on, or Near anExtrinsic Muscle Region of a Tongue

It is also contemplated that other devices and methods could be utilizedto stabilize and maintain a patient's airway in order to treat sleepapnea. For example, an implant structure can be sized and configured forimplantation in, on, or near an extrinsic muscle region affectingmovement and/or shape of a tongue. Examples of such extrinsic musclesinclude, e.g., the genioglossus, hyoglossus, styloglossus, andpalatoglossus, as shown in FIG. 1B. The position of the structure isstabilized relative to the extrinsic muscle region to maintain thetongue in a desired orientation.

An implant structure having these technical features can take variousforms, representative examples of which follow.

A. Bracing Member for an Extrinsic Muscle Region

FIGS. 23A to 23C show, as one representative example, an implantstructure comprising a bracing member 72 that is sized and configuredfor implantation in, on, or near an extrinsic muscle region affectingmovement and/or shape of a tongue. As shown in FIG. 23A, the bracingmember 72 is sized and configured to overlay, at least in part, anextrinsic muscle region beneath the tongue.

As shown in FIG. 23A, an incision is made in the skin on one side of themandible 36. A hook-like device 78 is inserted that extends up and overthe genioglossus muscle 38 and then comes back down on the other side ofthe mandible 36, as FIG. 23B shows. Through the same skin incision, thebracing member 72 is inserted and the first end of the brace 72 isattached to the first side of the mandible 36, as shown in FIG. 23C. Thebracing member 72 uses the same incision as the hook 78, and is insertedsuch that the brace 72 extends on top of an extrinsic muscle region(which, in FIGS. 23A to 23B, includes the genioglossus muscle 38) andcontinues to be inserted until it reaches the opposite side of themandible 36. A second incision is made in the skin under the second sideof the mandible 36 and the second end of the bracing member 72 isattached to the second side of the mandible 72. The hook-like device 78is then removed from the tongue 34.

The bracing member 72 may be attached to the mandible 36 using anymedically proven and accepted methods and materials including, but notlimited to, small screws and/or biocompatible adhesives.

The bracing member 72 is sized and configured to deflect the extrinsicmuscle region (i.e., the genioglossus muscle 38) caudally, causing thetongue 34 to move anteriorly, thus maintaining a patent airway.

B. Hooking Member for an Extrinsic Muscle Region

FIGS. 24A to 24C show, as another representative example, an implantstructure comprising a hooking member 80 that is sized and configuredfor implantation in, on, or near an extrinsic muscle region affectingmovement and/or shape of a tongue. As shown in FIG. 23B, the hookingmember 80 is sized and configured to extend through an extrinsic muscleregion beneath the tongue.

As shown in FIGS. 24A to 24C, an anchoring component 74 is coupled tothe hooking member 80. As shown in FIGS. 24A to 24C, the assembly of theanchoring component 74 and hooking member 80 have the appearance of ahook (i.e., the hooking element 80) coupled to a buckle (i.e., theanchoring component 74), and these components will therefore inshorthand be referred to as such.

The hook 80 can be formed as a separate piece which couples to thebuckle 74, or can be formed as a part of the buckle 74.

As shown in FIG. 24A, an incision is made under the skin to create apocket sized to fit the buckle 74. The buckle 74 may then be insertedinto the pocket, under the extrinsic muscle region (which, in FIGS. 24Ato 24C includes the genioglossus muscle 38. The hook 80 is opened toplace it over the extrinsic muscle region (i.e., the genioglossus muscle38), as FIG. 24B shows.

Because the hook 80 is attached to the buckle 74, the genioglossusmuscle 38 is deflected caudally, causing the tongue 34 to move in ananterior direction, thus maintaining a patent airway.

In another representative embodiment, as shown in FIG. 24C, the hook 80can be reattached on the other side of the buckle 74 using a chinattachment clamp 82. A second skin incision on the other side of themandible 36 might be necessary in order to attach the hook 80 on theother side of the buckle 74. In this arrangement, the buckle 74 includesa chin attachment clamp 82. The first end of the chin attachment clamp82 is coupled to the end of the buckle 74. The second end of the chinattachment clamp 82 is attached to at least a portion of the chin ormandible 36. Desirably, the chin attachment clamp 82 will be adjustablein length either interoperatively or under local anesthesia so as topermit the surgeon to adjust the position of the buckle 74 to achieveoptimal therapeutic effects based on each individual patient's needs.The bend angle on the clamp section can be between 0° and 70°, dependingon the individual's needs. Depending on the individual's anatomy, thechin clamp 82 may need to be screwed onto the mandible 36. Once the hook80 is attached to the buckle 74, the genioglossus muscle 38 is deflectedcaudally, causing the tongue 34 to move in an anterior direction.

C. Elastomeric Structure for an Extrinsic Muscle Region

FIG. 25A shows, as another representative example, an implant structurecomprising an elastomeric structure 76 that is sized and configured forimplantation in an extrinsic muscle region affecting movement and/orshape of a tongue. As shown in FIG. 25A, the elastomeric structure 76takes the form of a spring.

As shown in FIG. 25A, the extrinsic muscle region includes thegenioglossus muscle. The spring 76 extends in the muscle region to pullthe tongue 34 forward. The spring 76 is coupled to a tissue graspingmember, which, in the illustrated embodiment, takes the form of a hook77 implanted in the tongue 34. The spring 76 implanted in the extrinsicmuscle region maintains gentle tension on the hook 77. A bar or button40 may be attached to the spring 76 on the outer portion of the mandible36 to retain the spring 76 in its position. As an alternative to thespring 76, an elastomeric band may be used.

Alternatively (as shown in FIG. 25B), a needle can be placed all the waythrough the tongue 34. A pocket 79 may be formed in the submucosa in thevicinity of the needle exit point. In this arrangement, a clip 81 can befastened to the spring 76 in the pocket. This arrangement couldeliminate the bar 40.

D. Tissue-Tensioning Elastomeric Structure

FIGS. 26A, 27A and 28A show additional representative examples of animplant structure comprising an elastomeric structure 500 sized andconfigured for implantation in a tissue region affecting movement and/orshape of a tongue. As shown in FIGS. 26A and 27A, the treatment devicetakes the form of an elongated elastomeric structure 500 that is sizedand configured for implantation in a desired orientation in the tongueor an extrinsic muscle of the tongue. The elastomeric implant structure500 is adapted to reshape or move the tongue when implanted in thetongue of an extrinsic muscle of the tongue.

As shown in FIGS. 26A to 26D and 27A to 27D, the elastomeric structure500 may take the form of a spring. Although the structure 500 may haveany cross-sectional shape, in the illustrated embodiments, theelastomeric structure has a generally circular (for example, the coiledspring structure 510 shown in FIG. 26C) or semicircular cross-section(for example, the semicircular spring structure 520 shown in FIG. 27C).

The elongated elastomeric structure 500 is also desirably generallyelastic. The illustrated embodiments contain coils 512 or perforations522 which allow the elastomeric structure to switch between a relaxedstate (see FIGS. 26A and 27A) and an extended, stressed state (see FIGS.26D and 27D).

As shown in FIGS. 28A to 28B, the elastomeric structure 500 may take theform of a braided tube 501 that resembles Chinese finger cuffs. As seenin FIG. 28A, in its relaxed position, the tube 501 has a relatively widediameter and shorter length. As seen in FIG. 28B, in its elongatedposition the tube 501 has a relatively narrow diameter and issignificantly longer than in the relaxed position.

The elongated elastomeric structure 500 can be made of metal material,e.g., Nitinol, other shape-memory alloys, shape-memory polymers, ortitanium, as well as any other material known in the art to exhibitsimilar characteristics of biocompatibility, elasticity, and resilience.

The elongated elastomeric structure 500 may further be flexible tofacilitate its implantation in a targeted tissue region of an individualand thereafter conform to the desired tension and orientation. Thedesired tension and orientation will depend upon the morphology of thetissue region and the particular treatment objectives.

In use, the elastomeric structure desirably is implanted in the tissuewhen the structure is in a stressed or extended state (see FIGS. 26D,27D and 28B). In this manner, after the structure is implanted into thetongue, the structure will revert to its natural, unstressed position,thus pulling the tongue into a more forward position. The elongatedelastomeric structure may, but does not necessarily need to, be anchoredto the mandible.

In use, one or more elongated elastomeric structures 500 can beimplanted at a selected tissue region, depending upon the treatmentobjectives. The number of implanted elongated elastomeric structures 500is governed by the location of the tissue region and the treatmentobjectives, e.g., a desired shape or bias that is to be imparted to thetissue region, and/or the maintenance of a desired tension in the tissueregion, and/or the maintenance of a desired orientation of the tissueregion relative to another tissue region, e.g., to keep an airwaypatent.

The desired orientation comprises the selective application of tensionto the elongated elastomeric structure 500 after its implantation toaffect a desired change in shape, orientation, and/or other physiologiccharacteristic within the tissue region.

The desired orientation in this embodiment is governed by the treatmentobjective of urging or maintaining the tongue in a desired anteriororientation away from the uvula and/or pharyngeal wall. Therelaxed/shortened structure 500 serves to maintain tension, so that thetissue region itself is maintained in a desired orientation, to therebyresist posterior collapse of the tongue against the uvula and/or thepharyngeal wall.

It is desirable to place the elastomeric structure into an extended orstressed position (see FIGS. 30A to 30F), and retain the structure inthat position for at least the period of time during which the implantis being implanted into the tongue. The elongated elastomeric structure500 can be placed into an extended or stressed position (see FIGS. 30Ato 30F) in various ways.

In a first representative example the implanted elastomeric structure500 can comprise a shape memory metal material that assumes apredetermined, remembered shape in response to an applied activationenergy. The activation energy can comprise thermal energy, as well aselectrical energy, mechanical energy, electromagnetic energy, acousticenergy, or light energy.

The shape memory material can comprise an alloy, e.g., Nitinol® alloy(an alloy consisting of nickel and titanium), and copper based alloys,most commonly Cu—Zn—Al and Cu—Al—Ni. The shape memory material 44 canalso comprise a shape memory polymer.

FIG. 29B shows an elastomeric structure 500 made of a Nitinol® shapememory alloy. The structure 500 is implanted in the tongue (see FIGS.29D to 29G). As shown in FIG. 29B, the structure 500 possessesrelatively compliant mechanical properties at certain temperatureconditions (in this case, 25° Celsius), which is sometimes called thesoft martensitic phase. Since structure 500 is soft during themartensitic phase, it is maintained in an elongated shape using aninternal support within the delivery cannula 570, which may take theform of a plunger device 581 with arms 582 that are released uponimplantation within the tongue tissue, see FIGS. 29D to 29E.Alternatively, as will be described in the following section, structure500 in the martensitic phase may also be maintained in an elongatedstate using various biodegradable materials or structures.

In response to increased temperature conditions, the structure 500assumes less compliant mechanical properties (see FIGS. 29F and 29G),accompanied by accelerated shape change. This is sometimes called thehard austenitic phase. In this phase (as shown in FIGS. 29F and 29G),the structure 500 provides a dynamic resistance to shape change. In theillustrated embodiment, the change in temperature conditions is broughtabout by an external activation energy source that is used whenactivation is desired. The activation source can comprise a source ofheat, in this case, implantation into tongue tissue. Upon raising thetemperature of the elastomeric structure 500 to normal body temperature(approximately 37° Celsius), the elastomeric structure 500 shortens inlength and, in the process tensions the tongue tissue causing the airwayto remain patent when the muscles otherwise relax during sleep.

In the case of the elastomeric structure 500 that resembles Chinesefinger cuffs, the structure also enters a martensitic phase atapproximately 25° Celsius. During this martensitic phase, structure 500is weakened and can be elongated. As with the previous example, duringthe martensitic phase structure 500 needs to be supported by a plungerdevice 581, or similar device. Once structure 500 has been implanted inthe tongue tissue, its internal temperature rises to approximately 37°Celsius, and the structure enters the austenitic phase, where structure500 once again becomes rigid and shortens in length. As seen in FIG.28B, during the martensitic phase the angle β, between two braids thatcross over each other and where the angle faces either one of the twohollow ends of structure 500, is less than 90°. As structure 500re-enters the austenitic phase, the same angle widens considerably toreturn to its pre-set value of over 90°. Again, upon raising thetemperature of the elastomeric structure 500 to normal body temperature(approximately 37° Celsius), the elastomeric structure 500 shortens inlength and, in the process tensions the tongue tissue causing the airwayto remain patent when the muscles otherwise relax during sleep.

In a second representative example the structure is placed in a stressedposition by stretching the structure 500 and filling the space createdbetween coils 512 of structure 510 (FIG. 30A) or within the openedperforations 522 of structure 520 (FIG. 30C), with a bio-absorbablematerial 530 capable of quick absorption by the body. The bio-absorbablematerial may include substances such as collagen, fibrin glue, orpolyglycolic acid (PGA). Desirably, the mass absorption period of thebio-absorbable material 530 used to fill the perforations or the spacebetween the coils of structure 510 will be less than the amount of timenecessary for tissue in-growth to start between the coils 512 (FIG. 30A)or in the perforations 522 (FIG. 30C) (usually about three weeks). Inthis manner, when the bio-absorbable material is absorbed by thesurrounding tissue, the elongated structure will return its relaxedstate.

In an alternative embodiment, structure 500 is placed in an extendedstressed position by using absorbable sutures 540 wrapped around thecoils 512 of structure 510 (see FIG. 30B) or threaded through theperforations of structure 500 (see FIG. 30D). Desirably, the massabsorption period of the absorbable sutures 540 used to fill theperforations 522 of structure 520 or the space between the coils 512 ofstructure 510 will be less than the amount of time necessary for tissuein-growth to start in the perforations 522 of structure 520 (FIG. 30D)or between the coils 512 of structure 510 (FIG. 30B) (usually aboutthree weeks). In this manner, when the absorbent sutures are absorbed bythe surrounding tissue, the elongated structure will return to itsrelaxed state.

In yet another alternative embodiment seen in FIGS. 30E and 30F,structure 500 may be placed in an extended state by interspersing beadsof material that biodegrades at different rates. As an example PGA beads512 may be interspersed between poly-L-lactic acid (PLLA) beads 511, seeFIG. 30E. PGA beads 512 will biodegrade at a much faster rate than PLLA511 beads, thus allowing for a gradual return of structure 500 from astressed/extended state to a relaxed/shortened state, see FIG. 30F.

Other methods (not illustrated) also contemplate placing a tube over anextended elongated elastomeric structure 500 and embedding the structurein a bioabsorbable material, while maintaining a centrally-locatedchannel through the bioabsorbable material to allow the insertion of ananchor to be attached to one end of the structure 500. The tube coveringthe embedded elongated elastomeric structure would then be removed andthe structure 500 would be implanted in the tongue tissue or muscle.

The elongated elastomeric structure 500 may be coupled to a tissuegrasping member, which, in a first illustrated embodiment, takes theform of an anchor 550 implanted in the tongue 34. This anchor 550secures the structure to the tongue. The anchor may be of any type knownin the art. Representative examples include a stent anchor (see FIGS.31A to 31C) and a daisy anchor (see FIGS. 33A to 33C).

As shown in FIGS. 31A to 31C, a stent anchor 560, a shortened version ofan angioplasty cardiovascular stent, can be used for securing theelastomeric structure in the tissue region. FIG. 31A shows thecoil-shaped embodiment of the elastomeric structure retained in itsextended position by the use of sutures, as described above. A stentanchor, shown in its undeployed position, is attached to one end of thecoil. FIG. 31B shows the coil-shaped embodiment of the elastomericstructure retained in its extended position by the use of bio-absorbablematerial, as described above. A stent anchor, shown in its undeployedposition, is attached to one end of the elongated elastomeric structure.FIG. 31C shows an elongated elastomeric structure 500 where the stentanchor 560 has been deployed and the elastomeric structure has returnedto its relaxed state because bio-absorbable material or sutures wereabsorbed by the body.

FIGS. 32A to 32C show a method of inserting the elongated elastomericstructure 500 with an attached stent anchor into the tissue of thetongue. First, a hole is formed through the mandible into the tonguetissue (see FIG. 32A). Next, a cannula pre-loaded with an elongatedelastomeric structure 500 and attached stent anchor 560 is inserted intothe hole such that the stent anchor is located at the posterior end ofthe tongue 34. As seen in FIG. 32C, once the implant is in its desiredlocation, the stent anchor 560 is then deployed using any method(including but not limited to, self expansion or balloon expansion)known and practiced by those in the field of interventional cardiologyinvolving neuro, peripheral vessels and the cannula is removed. A bar orbutton 40 may be attached to the elongated elastomeric structure 500 onthe outer portion of the mandible 36 to retain the elongated elastomericstructure 500 in its position, as shown in FIG. 32C.

As seen in FIG. 34D, it is also contemplated that two self-deployablestent anchors 560 could be used, one on each end of the elongatedelastomeric structure 500. This arrangement could eliminate the bar orbutton 40 shown in FIG. 32C.

As the bio-absorbable material 530 or absorbable sutures 540 areabsorbed within the tissue region, the elongated elastomeric structure500 implanted in the extrinsic muscle region develops gentle tension onthe stent anchor 560, keeping the tongue tissue from collapsingposteriorly and thus maintaining the airway patent.

It is contemplated that the stent anchor may be deployed by collapsingthe stent under pressure and enclosing it in a sheath. Once the implantis in its desired location, the sheath is pulled back and the stentanchor starts to return to its original expanded position, penetratingthrough and embedding itself further into the surrounding tissue. As thebio-absorbable material 530 or absorbable sutures 540 are absorbedwithin the tissue region, the elongated elastomeric structure 500implanted in the extrinsic muscle region develops gentle tension on thestent anchor 560, keeping the tongue tissue from collapsing posteriorlyand thus maintaining the airway patent.

The stent anchor can be removed by re-inserting a cannula-type deviceover the elongated elastomeric structure, collapsing the stent anchorand re-sheathing it.

Alternatively, (as shown in FIGS. 33A to 33C), the elongated elastomericstructure 500 may come equipped with at least one self-deployabledaisy-type anchor 580, hereinafter “daisy anchor” for use in securingthe elastomeric structure to the selected tissue region. FIG. 33A showsan elastomeric structure 500 retained in its expanded position bybio-absorbable material 530 with an undeployed daisy anchor 580 attachedto one end. FIG. 33B shows an elastomeric structure 500 retained in itsexpanded position by absorbable sutures 540 with an undeployed daisyanchor 580 attached to one end. As seen in FIGS. 33A and 33B, the daisyanchor 580 comprises a plurality of “petals” or arms. When the daisyanchor 580 is in its undeployed position the arms are held in anessentially vertical position (see FIGS. 33A and 34B).

FIG. 31C shows an elastomeric structure 500 where the daisy anchor 580has been deployed and the elastomeric structure 510 has been returned toits relaxed state because the bio-absorbable material 530 or sutures 540have been absorbed by the body. As shown in FIG. 33C, when the daisyanchor 580 is deployed the “petals” or arms “bloom” or expand and thuspenetrate the surrounding tissue to secure the elastomeric structure 500in its desired position. The daisy anchor can be removed by re-insertinga cannula-type device over the elongated elastomeric structure andre-sheathing the anchor.

FIGS. 34A to 34C shows a method of inserting the elongated elastomericstructure 500 into the tissue of the tongue. First, a hole is formedthrough the mandible into the tongue (see FIG. 34A). As shown in FIG.34B a cannula 570 pre-loaded with an elongated elastomeric structure 500and a daisy anchor 580 attached on the end is then inserted into thetongue such that the daisy anchor 580 is located at the posterior end ofthe tongue 34. As seen in FIG. 34B, the elongated elastomeric structure500 should be put in its extended stated, as was described above. Thecannula 570 maintains the arms in the “deployment-ready” state, which isin an essentially vertical position.

As seen in FIG. 32C, once the implant is in its desired location, thedaisy anchor 580 is then deployed by pulling out the cannula. When thecannula is retracted, the daisy anchor 580 arms expand and penetrateinto the surrounding tissue to anchor the elongated elastomericstructure 500 into its desired location. A bar or button 40 may beattached to the elongated elastomeric structure 500 on the outer portionof the mandible 36 to assist in retaining the elongated elastomericstructure 500 in its position.

As the bio-absorbable material or absorbable sutures are absorbed withinthe tissue region, the elongated elastomeric structure 500 implanted inthe extrinsic muscle region develops gentle tension on the stent anchor560, keeping the tongue tissue from collapsing posteriorly and thusmaintaining the airway patent.

As seen in FIG. 34D, it is also contemplated that two self-deployabledaisy anchors 580 could be used, one on each end of the elongatedelastomeric structure 500. This arrangement could eliminate the bar orbutton 40 shown in FIG. 34C.

It is also contemplated that the inside of the cannula can contain aplunger device, as is well known in the art, that pushes the elastomericstructure 500 with attached daisy anchor 580 into the tissue before theretraction of the cannula.

E. Tension Adjuster for the Tissue-Tensioning Elastomeric Structure

FIGS. 35A to 35C show a representative example of a spring expander thatmay be used with the coiled spring structure 510 (as shown in FIG. 26Ato 26D). As seen in FIG. 35A, the spring expander 590 is a flexiblecylindrical shaft with a helical ridge or thread wrapped around it. Thehelical ridge begins near the proximal end of the flexible cylindricalshaft and mates with the complementary helix formed by the coiled springstructure 510. The flexible cylindrical shaft 592 is desirably made froma material such as titanium, Nitinol, or a polymer.

As seen in FIG. 35B, the process of inserting/twisting the cylindricalshaft 592 into the coiled spring structure 510 causes structure 500 toswitch to its stressed, expanded position. As seen in FIGS. 35B and 35C,twisting part of the cylindrical shaft 592 out of the elongatedelastomeric structure causes the corresponding part of the coiled springstructure 510 to switch to its relaxed position. The process of twistingin and out the cylindrical shaft 590 with respect to the coiled springstructure 510 allows the surgeon to control the tension exerted byand/or the elasticity of the structure 510 on the tissue where it hasbeen implanted and to adjust this tension to maximize the therapeuticbenefit.

As FIG. 35C shows, the cylindrical shaft 592 attached to an anchoringdevice 610. In use, the shaft 592 would extend through the mandible andthe anchoring device would be located on the outside the mandible (seeFIG. 36D). The anchoring device 610 may take any suitable forms alreadywell-known in the art, such as buttons, sockets, etc. In therepresentative embodiment shown in FIG. 35C, the cylindrical shaft 592may include an externally threaded portion at the distal end of thecylindrical shaft 592. The anchoring device 610 may include aninternally threaded portion, such that the anchoring device 610 may besecured to the cylindrical shaft 592 by screwing the anchoring device610 to the cylindrical shaft 592. Essentially, the length of thecylindrical shaft 592 may be adjusted at any of various locations of atthe attachment point to the anchoring device 610.

In use, the coiled spring structure 510 will desirably come with apre-inserted spring expander 590 (see FIG. 36C). However, it is alsocontemplated that during the surgery, the physician will twist thespring expander 590 into the coiled spring structure 510 to extend thecoiled spring structure 510. The coiled spring structure 510 is placedand then maintained in a stressed, extended position by the twisting inof a flexible cylindrical shaft 592 with a complementary helix.

FIGS. 36A to 36E show a method of inserting a spring expander 590—coiledspring structure 510 assembly. FIG. 36C shows a spring expander with apre-inserted coiled spring structure 510 with an anchor. The anchor maybe of different types, including the stent anchor 560 and the daisyanchor 580; desirably, it will be self-deployable. In the illustratedembodiment, a daisy anchor 580 is be used, which can be deployed in thetissue region.

As seen in FIG. 36A, a hole is formed in the mandible. FIG. 36B showsthe insertion of a trocar and cannula 570 assembly pre-loaded with: anelongated elastomeric structure 510, a daisy anchor 580 attached to thedistal end of structure 510, and a spring expander 590 twisted into theproximal end (to be located in the anterior portion of the oral cavity)of structure 510.

As seen in FIGS. 36D and 36E, once the implant is in its desiredlocation, the daisy anchor 580 is then deployed by pulling out thecannula causing the daisy anchor 580 to “bloom”, where the “petals”/armspenetrate into the surrounding tissue to anchor the elongatedelastomeric structure 500 into its desired location. Once the daisyanchor 580 at the distal end of the coiled spring structure 510 isself-deployed, it secures the distal end of the coiled spring structure510. The surgeon then adjusts the tension exerted by the coiled springstructure 510 on the tissue where it has been implanted to maximize thetherapeutic benefit and attaches the flexible cylindrical shaft to thehole in the mandible by any of a variety of means familiar to thoseexperienced in this art (see FIGS. 36D and 36E).

As seen in FIG. 36D, a button 40 may be attached to the spring expander590 on the outer portion of the mandible 36 to retain spring expander590 and associated coiled spring structure 510 in its position.

Future adjustments to the tension in the elongated elastomeric structurecan be easily performed under local anesthesia in the surgeon's office.To perform adjustments, the button 40 would be removed from the end ofthe spring expander 590. The spring expander 590 would then be rotatedto adjust the coiled spring structure 510 as needed. Rotating the springexpander 590 in a first direction would cause more of the springstructure 510 to be in the relaxed position and would increase thetension in the spring structure 510. Rotating the spring expander 590 inan opposite, second direction would cause more of the spring structure510 to be in the extended position and would decrease the tension in thespring structure 510. The foregoing is considered as illustrative onlyof the principles of the invention. Furthermore, since numerousmodifications and changes will readily occur to those skilled in theart, it is not desired to limit the invention to the exact constructionand operation shown and described. While the preferred embodiment hasbeen described, the details may be changed without departing from theinvention, which is defined by the claims. The scope of this inventionshall be determined from the scope of the following claims, includingtheir equivalents.

1. An implant system comprising at least one elongated body sized andconfigured for implantation in a desired orientation in a tissue regionin an airway, and an array of projections extending from the elongatedbody and being resiliently coupled to the elongated body in a normallybiased outward extending condition sized and configured to engage tissueand resist a reorientation of the elongated body within the tissueregion out of the desired orientation after implantation of theelongated body in the tissue region, the array of projections beingsized and configured to resiliently yield by flexing inward against theelongated body during implantation of the elongated body in the tissueregion.
 2. An implant system according to claim 1 wherein the desiredorientation of the elongated body includes a state of tension.
 3. Animplant system according to claim 2 further including a component toadjust the state of tension.
 4. An implant system according to claim 1wherein the desired orientation of the elongated body includes acurvilinear configuration.
 5. An implant system according to claim 1wherein the elongated body comprises a flexible material.
 6. An implantsystem according to claim 1 wherein the elongated body comprises asuture material
 7. An implant system according to claim 1 wherein atleast one of the projections comprises a flexible material.
 8. Animplant system according to claim 1 wherein at least one of theprojections comprises a barb.
 9. An implant system according to claim 1wherein the elongated body is sized and configured for implantation in adesired orientation in a palate.
 10. An implant system according toclaim 1 wherein the elongated body is sized and configured forimplantation in a desired orientation in a uvula.
 11. An implant systemaccording to claim 1 wherein the elongated body is sized and configuredfor implantation in a desired orientation in a tongue.
 12. An implantsystem according to claim 1 wherein the elongated body is sized andconfigured for implantation in a desired orientation in an epiglottis.13. An implant system according to claim 1 wherein the elongated body issized and configured for implantation in a desired orientation in amuscle along an upper respiratory tract.
 14. An implant system accordingto claim 1 further including a tissue anchor coupled to the elongatedbody.
 15. An implant system according to claim 1 further including abone anchor coupled to the elongated body.
 16. An implant systemaccording to claim 1 further including an implantation tool sized andconfigured to be introduced into the tissue region and having aninterior bore accommodating passage of the elongated body forimplantation in the tissue region.
 17. An implant system according toclaim 16 wherein the implantation tool includes a distal end regionsized and configured to penetrate tissue.
 18. A method comprisingselecting a tissue region in an airway, and providing at least oneelongated body sized and configured for implantation in a desiredorientation in the tissue region, the elongated body including an arrayof projections extending from the elongated body and being resilientlycoupled to the elongated body in a normally biased outward extendingcondition sized and configured to engage tissue and resist areorientation of the elongated body within the tissue region out of thedesired orientation after implantation of the elongated body in thetissue region, the array of projections being sized and configured toresiliently yield by flexing inward against the elongated body duringimplantation of the elongated body in the tissue region, and implantingthe at least one elongated body to stabilize a desired orientation ofthe tissue region.
 19. A method according to claim 18 wherein the tissueregion selected includes a palate.
 20. A method according to claim 18wherein the tissue region selected includes a uvula.
 21. A methodaccording to claim 18 wherein the tissue region selected includes atongue.
 22. A method according to claim 18 wherein the tissue regionselected includes an epiglottis.
 23. A method according to claim 18wherein the tissue region selected includes a muscle along an upperrespiratory tract.
 24. A method according to claim 18 wherein implantingincludes placing the at least one elongated body in a state of tensionin the tissue region.
 25. A method according to claim 18 whereinimplanting includes anchoring the at least one elongated body to tissue.26. A method according to claim 18 wherein implanting includes anchoringthe at least one elongated body to bone.
 27. A method according to claim18 wherein implanting includes placing the at least one elongated bodyin a curvilinear orientation.
 28. A method according to claim 18 whereinimplanting includes passing the elongated body through an implantationtool.